I recently bought a dell XPS 8300 which has two open 6 PIN PCI Express power supply plugs. I wanted to upgrade the sound card to a Xonar Essence STX card. My problem is that the STX needs a Molex (LP4) power supply and the dell only has 6Pin PCI Express plugs. Can I convert the PCI Express plug to a Molex (LP4) female plug? IF so, how and what cables do I need? I can find cable to convert 4PIN to 6PIN, but not 6PIN to 4PIN.